Proth Search Page |

Primes k · 2 + 1 ^{n} |
List of primes for k < 300
List of primes for 300 < k < 600
List of primes for 600 < k < 900
List of primes for 900 < k < 1200
Frequencies (draft) History (under preparation) |

Fermat numbers |
Standard factoring status
Factors of generalized Fermat numbers GFN03 factoring status GFN05 factoring status GFN06 factoring status GFN07 factoring status GFN10 factoring status GFN11 factoring status GFN12 factoring status Search limits and reservations |

Primes k · 2 − 1 ^{n} |
List of primes for k < 300 |

The Sierpiński problem |
Definition and status |

The Riesel problem |
Definition and status |

Cullen primes |
Definition and status |

Woodall primes |
Definition and status |

New factorization at GFNsmall.html:

11^(2^8) + 10^(2^8) = P62 * P107 .

December 30, 2017:

Riesel problem candidate eliminated!

December 28, 2017:

Two new Fermat factors.

December 21, 2017:

Prime lists and GFNfacs.html updated.

New factorization at GFNsmall.html:

10^(2^8) + 9^(2^8) = P119 * P138 .